Comment A few things (Score 1) 731
First, chip & pin is how Europe does not, not the "rest of the world". In my travel around Asia I haven't seen chip & pin cards or machines anywhere (anecdotal evidence it may be, but it definitely isn't universal). I got a (rare) US chip & pin card just in case for my travels a few years ago, and so far had not a single chance to use it - not even on a recent trip to Germany. In places that could "go either way" that card still fell back to signature mode (though, perhaps, that's more of an issue of how VISA presents it).
Secondly, chip & pin has one interesting issue in US market - tipping at restaurants and such places. The (imho vile) practice of inflating one's bill by 20-25% post-consumption is not particularly common in the chip & pin world. Since chip & pin transaction has to be fully concluded at pin entrance, we would have to tip at restaurants through hand-held machines brought to our table, while waiter is standing there looking on anxiously. I am guessing tip rates can then go to 50%?